Air-pump.



F. S. CARVER.

AIR PUMP. APPLICATION FILED DEO.18, 1907.

Patented igf 2 FRED s. oARvEm'or BROQKLYJSI, NEW oRKX.

, matic tires,

lyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in A1r-Pumps,v0f

which the following is a specification.

This invention relates to; air pumpsand is particularly useful inf connection with pumps designed for theinfiation of pneu- The invention comprises-a pump in which equal amounts of air will be discharged-at its stroke in each direction. 1

In the drawings accompanying and for1ning av part of this specification, Figure 1 represents apracticable embodiment'ofa form of my invention, the pump therein being shown in central section; and Fig. 2. is an enlarged view on a similar sectionof a portion of the cylinder and the piston.

In the form herein illustrated the pump is shown provided with a suitable form of handle 3 and a-stirrup 4 so that relative movement may be producedbetween the piston and the cylinder. d n

In the present embodiment the piston 5 is carried by apiston rod 6 which is fast with the stirrup and thecylinder or casing 7 is securedtov a head 8. which is fast with the handle 3; so that in this form of construction the piston,='while the pump is in operation, will remain stationary. and the cylinder will be reciprocated. ,The piston rod 6 is provided with a discharge channel 9 which communicates by means of suitable passages in the present instance with the flexible tube 10. The device being particularly applicable for use for the inflation of pneumatic tires, the connection 10 will be that which is used to connect the pump with the valve of the tire. This, however, is a detail of construction. The casing 7 will constitute, as it reciprocates, in its excursions and recessions. of reciprocation, a cylinder for each end of the piston, and these ends for the purpose of simplifying'the description will be designated by 30 and 40 respectively; the head 8 constituting the head for the cylinder 30 and the head 11 constituting the head for the cylinder-4.0. It will be seen that the head 11 is securely-fastened to the casing 7. The head 8 is provided with an inlet port 31 controlled by the valve 82 which will yield in-- wardly to suction from the piston and will he closed by its spring upon the cessation of Specification of. Letters 'lflitent A plication filed December 18, 1907. swan No. 406,978 I v uction, and will' be forced to its seatlby O pression within the cylinder. The head 11 is provided: with a-similar porb'ttl and valve e2. a. The piston is shown its-shaving 'a 'reducecl portion 12 screw threaded uponits exterior for receiving a compressioir ring-"13. The

packing, for the piston, which' constitutes packing members 14L and 15 is disposed about this reduced portion '12 ai1d-j-separated-gby,a more or less rigid disk' -l'fi saiidgpr means of the screw threaded ring" g the shoulder presented by: the flange The ring 16 fits the reduced portion-". 12

closely and has a working 'fitwith-the cylinder, and isthus enabled to act as a guide for the piston and. prevents thepackjing:

ing, jammed. onqone side and' 'dra-wn away i from the cylinder on the other side wlien'tlie relative movement-of the-piston-and. cylinder are not in a straight-line. Since this-piston has to. perform equal functionsin both d'i rections the structure ofthe packing isfpref 25 erably such that it presents faces which-will expand outwardly against the walls of the cylinder asthepiston is moving in the. dirc; tionrofth'at particular portion of' thepaclfcing. {Ihe members 14;and15arctshowng1as cup shaped and thecuppofhone opens andjis supported by the flange: 17 and the cup-"of theother by the compression ring 13.

The piston is providedgwith portsfidahd 43 leading from the respective cylinders through the piston-headandyinto the-fchannel t) ofthe piston 1Od.;';.-;il1[lih present-form of construction, a valve chamber 18 is lo cated within the piston head. When the device is intended for automobile use, it will preferably be so organized that the cylinder and piston rod will be disposed in a vertical position when the device is in use, and the valve which is disposed within the piston head, when it is desired to employ a valve which will remain in whatever position'the currents of air have forced it, will have a horizontal movement. The valve illustrated comprises a valve body 19 which will conform to the size and shape of the valve chamber and will move horizontally therein. In constructing the piston head, the hole which is bored for the port opening 43 maybe carried on across the valve chamber as at 34. This will constitute not only a communication from the port 33 movement, the charge alined horizontally disposed guides for the valve stems 20 and 21. These valve stems may be of angular formation in cross-sectional direction so that they will permit free passa e of air past them and into the valve cham 1' without impairing their efliciency as su ports for the valve body. The valve cham er is shown having a port 22 in communication with the channel'9 of the piston rod. Packing rings 23, 24 may be placed at the respective ends of the valve chamber for the engagement of the valve 19 so that when the piston is moving into the cylinder 30 and compressin the air therein against the valve 32, the va ve 19 will be forced against the packing 24 thereby valving the port 43 and opening communication between the port 22, which, as above stated, opens into the discharge channel 9, and the interior of the cylinder 30 throu h the port 33 and extension 34 and valve c amber 18. While the iston is moving into the cylinder 30, it will e moving out of the cylinder 40 and drawing a charge of air in throu h the inlet port 41 drawing the valve 42 or this purpose away from its seat. Upon a reversal of of air which, has been drawn into the cy lnd'er 40 will be compressed and force the valve 42 against its seat; The valve 19 will then be moved to the other :end of the valve chamber and" against the packing 23 thereby valving the port 33-34 and forcing the charge of air which is in the cylinder 40 through the port 43, the valve chamber 18 and port 22 into the discharge channel 9.;

The piston rod 6 is shown as being packed where it passes through the head 11, and the packing will be held in position by a suitable gland 25. Sprin s 26 and 27 are shown for butting the bee 11 upon its up ward and downward, movements respec tively.

Having thus described my invention, I claim:

q 1. In a pump, the combination with a horizontally disposed valve chamber provided with alined horizontally disposed inlet ports at its respective ends and a me dially disposed outlet port, packing within said chamber surroundlng each of said inlet ports, a valve body conforming in size and sha e to and located within said chamber an adapted to reciprocate therein, and supporting and guiding stems projecting from the ends of said valve body and extending into and engaging the walls of the said inlet ports, said stems differing in cross sectional formation from that of the inlet ports.

2. In a pump, the combination with a c linder, of a piston therein having a val ve chamber, an inlet port at each end of said valve chamber, said ports being in alinement, one of said ports'being in communication with one end of the cylinder and the other port with the other end thereof, an outlet port from said chamber disposed me-, dially of the ends thereof, packing within said chamber surrounding each of said inlet ports, a valve body conforming in size and sha e to and located within said chamber an adapted to reciprocate therein, and supporting and guiding stems carried by the valve body and pro ecting from both ends thereof and extending into and engaging the walls of the said inlet ports, said stems differing in cross sectional formation from that of the inlet ports.

3. In a pump, the combination with a valve chamber provided with alined ports at its respective ends, and a medially disposed port, a valve body conforming in size and shape to and located within the said chamber and adapted to reciprocate therein, and supporting and uiding stems projecting from the ends of said valve body and extending into and engaging the walls of said alined ports, said stems differing in cross sectional formation from that of the said ports.

FRED S. CARVER. Witnesses:

CHAs. LYON RUSSELL, HENRY E. GREENWOOD. 

